Right now you are banned until 16.10.2012 for griefing.
Obviously the "my brother", "my kid", "my dog" excuse is nothing that we can confirm and since you are responsible for everything happening with your account it also won't really help getting unbanned.
Unreal is the admin who banned you and he will probably let you know if there is any chance of shortening the ban or not and he will also be able to provide you with info on what happened.
Make sure no one can access your account or play the game with it if you want to avoid this happening again.